Protector.



W. L. COOK.

PROTECTOR.

APPLICATION FILED mm. 21, ms.

Patented Apr. 10, 1917.

2 SHEETSSHEET 1.

1m: NORRIS Fcrrks m. Fnom-urncv. wAsmNc mul n c.

W. L. COOK.

PROTECTOR.

APPLICATION FILED MAR. 27, I916.

Patented Apr. 10, 1917.

2 SHEETSSHEET 2.

WALLACE L. COOK, OF CHICAGO, ILLINOIS.

PROTECTOR.

Specification of Letters Patent.

Patented Apr. 10, 1917.

Application filed March 27, 1916. Serial No. 86,907.

To all whom it may concern:

Be it known that I, vVALLAon L. Coon, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, ha ve invented a certain new and useful Improvement in Protectors, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to protectors and is more particularly of use in connection with those protectors used in connection with telephone switchboards, for instance, or other devices having delicate apparatus.

In my invention I utilize means of a fusible nature as one of the elements of protection, and use an open space out out such as a lightning arrester for the other means of protection.

My invention concerns itself with simplifying the protector structure in that the various parts are mounted upon insulating elements which are mounted in pairs upon a suitable metallic base plate through the agency of strain insulators, by which construction I am enabled to eliminate the deli cate insulating bushings and washers hitherto employed in protectors of this nature and which in such protectors have been necessary to insulate the mounting screws from the various metal parts. Owing to the limited space the insulating bushings and washers are small and thin and are readily susceptible to mechanical injury and to rupture from high tension and static electric charges.

My invention further contemplates simplifying the protector by bringing the switchboard cable wires to soldering clips which are associated with the front fuse clip. The mounting plate is covered with insulation so as to avoid any crosses between the switchboard wires and mounting plate.

My invention further contemplates attaching the soldering clips to the fuse clips by means of hollow rivets, by which I am enabled to manufacture the soldering clips and the fuse clips at a greatly lessened expense, without sacrificing efliciency. In order to maintain perfect electrical contact between fuse clips and soldering clips, these two parts have heretofore frequently been made from one piece of metal. Moreover, the shapes of the fuse clip andsoldering clip are such that if they are punched from the same piece of metal that a large per cent. of scrap metal would be left. By punching them from separate material this loss of scrap metal is avoided, the electrical contact between the two of them however being maintained by the use of the hollow rivet as heretofore stated.

I will explain the above specified form of carrying out my invention more in detail by referring to the accompanying drawings, in which Figure 1 is a top View of a protector section constructed in accordance with my invention;

Fig. 2 is an end view thereof;

Fig. 3 is a sectional view on line aa of Fig. 1;

Fig. 4 is a sectional View on line b-b of Fig. 1, and

Fig. 5 is a sectional view on line 0-0 of Fig. 1.

Fig. 6 is a detail perspective view, partly in section, of the fuse clip.

The entire protection for a plant is in general made up of a number of sections, such for instance as illustrated in Figs. 1 and 2, such a section accommodating twenty metallic lines. My improved protector section consists of a base plate 1 upon which two metallic strips 2 and 3 are mounted and held in place at their extremities by the screws 4 and intermediately by the rivets 5. These strips 2 and 3 have tongues 6 punched upwardly so that between these tongues and fingers 7 suitable open space cut outs or lightning arresters 8 may be mounted. Number plates 9 are provided at the extremities. Suitable mounting brackets 10 are riveted to the base plate 1 by the rivets 11 and thus serve for attaching the section into position on any suitable framework as may be desired. Insulating strips 12 and 13 are placed upon the opposite sides of the base plate 1. Individual sections of insulation 14, 14 and 15, 15 are mounted near the opposite edges of the base plate 1, and each one of these units has provision to accommodate five single lines. There are thus four pairs of units on each side of the twenty metallic line section. The units 14 each are provided with fuse clips 16 riveted to soldering clips 17 by the rivets 18. The two out side fuse units are held in place by means of screws 19 which enter screw threaded strain insulators 20 mounted in holes provided in the base plate 1. It will be seen that the units 1- on opposite sides are thus held in position by four screws 19 which enter the two strain insulators 20 as shown. There are thus no facilities for specially insulating the screws 19 or the fuse clips except the strain insulators 20. In the case of the remaining three fuse clips 16 andtheir associated soldering clips, screws 21 and nuts suffice to hold them in position, no special insulating requirements being necessary as the unit is is of an insulating character being preferably of porcelain or something of a similar nature. Small washers 23 are provided for purposes well understood.

It will be seen that the soldering clips 1'? of the lower units extend parallel to the soldering clips 17 so that the entering cable may be readily soldered to the various clips preferably at one given point. The units 15 carry, as already stated, the fingers 7 and in addition carry the fuse clips 2-1 and soldering clips 25, the three elements 7, 2A and 25 being again riveted together by a rivet 26. Screws 19 again serve to hold the two outside fuse clips in position by e11- gaging strain insulators 20 and the three connecting elements between the two outside ones are again merely held by screws 21 and nuts 22.

It will thus be seen that no special individual insulating facilities are provided as heretofore for the various connecting elements for each line. A very much simplified construction is thus obtained. Pencil fuses 27 are then mounted between the fuse clips as seen in the illustration. Stops 28 provided upon the parts 2 and 3 serve to limit the inward movement of the lightning arrester units 8.

From what has been described the nature of my invention will be readily apparent to those skilled in the art.

Having however thus described one form which my invention may take, what I claim as new and desire to secure by Letters Patent is:

1. A protector having a metallic base plate, a pair of strips of insulating material mounted on opposite sides of said base plate, contact elements insulatingly carried by said strips, an insulating sleeve projecting through said base pla e, and retaining means extending from said strips into said in sulating sleeve to hold said strips upon said base plate.

2'. A protector having a metallic base plate, a pair of strips of insulating material mounted on opposite sides of said base plate, contact elements insulatingly carried 'by said strips, a strain insulator projecting through said base plate, and retaining means extending from said strips into said strain insulator to hold said strips upon said base plate.

3. A protector having a metallic base plate, a pair of strips of insulating material mounted on opposite sides of said base plate near one extremity thereof, contact elements insulatingly carried by said strips, an insulating sleeve projecting through said base plate, retaining means extending from said strips into said insulating sleeve to hold said strips upon said base, a second pair of strips of insulating material mounted upon opposite sides of said base plate near the other extremity thereof, a second insulating sleeve projecting through said base plate, retaining means extending from said second pair of strips into said last aforesaid insulating sleeve to hold said strips upon said base plate, and fuse elements connecting corresponding contact elements of the first and second pair of strips.

4. A protector having a metallic base plate, a pair of strips of insulating material mounted on opposite sides of said base plate near one extremity thereof, contact elements insulatingly carried by said strips, a strain insulator projecting through said base plate, retaining means extending from said strips into saidstrain insulator to hold said strips upon said base, a second pair of strips of insulating material mounted upon opposite sides of said base plate near the other extremity thereof, a second strain insulator projecting through said base plate, retaining means extending from said second pair of strips into said last aforesaid strain insulator to hold said strips upon said base plate, and fuse elements connectingcorrespending contact elements of the first and second pair of strips.

5. A protector having a metallic base plate, a pair of strips of insulating material mounted on opposite sides of said base plate, contact elements insulatingly carried by said strips, a strain insulator projecting through said base plate, retaining means extending from said strips into said strain insulator to hold said strips upon said base plate, soldering clips extending from said contact elements, and sheets of insulation upon the opposite sides of said base plate.

6. A protector having a metallic base plate, a pair of strips of insulating material mounted on opposite sides of said base plate, contact elements insulatingly carried by said strips, an insulating sleeve projecting through said base. plate, and retaining means extending from said strips into said insulating sleeve to hold said strips upon said base plate, said retaining means also holding certain of said contactelements in place.

7. A protector havin a metallic base plate, a pair of strips of insulating material mounted on opposite sides of said base -plate, contact elements insulatingly carried insulator to hold said strips upon said base plate, said retaining means also holding certain of said contact elements in place.

8. A protector having a metallic base plate, a pair of strips of insulating material mounted on opposite sides of said base plate, contact elements insulatingly carried by said strips, a second pair of strips of insulating material spaced from said first aforesaid pair of strips and mounted on op- 15 posite sides of said base plate, contact elements insulatingly carried by said strips, sheets of insulation upon the opposite sides of said metallic base plate, and solder clips extending from said first aforesaid pair of strips inwardly.

WALLACE L. COOK.

Witnesses:

GEORGE W. RoDoRMER, HAZEL A. JONES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0. 

